Red vat dyestuffs and process of making same.



earn PROCESS OF MAKING SAME.

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To all whom it may concern Be it known that l, Rzormnn Hana, doctor oi philosophy, a subg'ect of the Kingdom of Prussia, and a resident of Frankfoitonthe-Main, in the Province of Hessehlassau and Kingdom of Prussia, Germany, have invented some new Red Vat D estufls and Processes of Making Same, of w ich the following is a full description.

, l have found that if diaminoanthraqut nones are condensed with alphanaphthoquinone and the products thus formed are then i urther suitably treated with halogenanthrw ouinones-new valuable vat dyestufi's are produced dyeing vegetable fibers claret-red to deep red shades, fast to washing, light and chlorin.

The dyestufis obtained probably possess the following general formula:

(where A; means: the residue from one anthraquinone molecule and A means: the

residue from another anthraquinone mole cule.)

fipecification of Letters Patent. I Application filed July as, 1913. Serial No. 780,698.

, color.

Patented July Z, 1914.

The process is illustrated by the following example:

Example: 24 kilos 1.5-dian1ino2inthraquinone, 240 kilos glacial acetic acid, 32 kilos alphanaphthoquinone are stirred together and warmed for 6 to 12 hours at 60 C. to 100 0., andthen allowed to cool. The product of condensation which separates nearly quantitatively, is filtered ofi', washed and dried. 39.5 kilos of this condensation product, 24.5 kilos betachloranthraquinone, 600 kilos nitrobenzene, 8.5 kilos anhydrous sodium acetate, and 0.5 kilos cuprous or cupric ehlorid are heated in a suitable vessel for 4 to 6 hours to 160 C. to 200 (1; when cold, the mass is diluted with alcohol, the separated product of condensat-ion is filteredofi, washed with alcohol first, and then with water containing some hydrochloric acid, and finally dried.

The substance, when dry, is a dark red powder, soluble with difiiculty in hot nitrobenzene with a red color, soluble in concentrated sulfuric acid with a brownish purple In an alkaline hydrosulfite solution it forms a brownish red vat, which dyes cot-- ton a claret red shade fast to washing, light and chlorin.

The coloring matter probably has the vfollowing constitution:

suitable halogenanthraquinones, substantially as described.

derived from alphanaphthoquinone by con 2. As a new article of manufacture the fast vat dyestuff of the anthraqulnone series,

densing it with diaminoanthraquinones and treating the products thus obtained with suitable halogenanthraquinones, having probably the following nucleus:

(where A; means: the residue from one anwith difiiculty soluble inthe usual organic described.

thraquinone molecule and A the residue from another anthraquinone mo1ecule,) be ing ina dry state brick red to dark red powders, insoluble in dilute acids and alkalis solvents, forming in an alkaline hydrosulfite solution brownish red vats which dye cotton claret red to deep red shades, fast to washing, light and chlorin, substantially as product thus obtained with betachloran- 30 thraquinone having probably the following chemical constitution:

being in a dry state a dark red powder,

a brownish purple color, forming with allzaline hydrosulfite ,solution a brownish red vat which dyes cotton claret red shades fast to washing, light and chlorin, substantially as described In witness whereof l have hereunto siied 4o soluble in concentrated sulfuric acid with my name this 8th day of July, 1918, in. the presence of two subscribing witnesses RICHARD HERZ, PH. D. Witnesses: JE N GRUND, CARL GRU'ND. 

